AirHint found the following cheapest return flights from Sydney (SYD) to Lisbon (LIS) in August 2025 (see full year).

Return flights

01 Aug - 31 Aug	Air China
01 Aug - 22 Aug	Air China
05 Aug - 19 Aug	Scoot Tigerair
01 Aug - 15 Aug	Air China
08 Aug - 17 Aug	Air China
13 Aug - 15 Sep	Turkish Airlines
06 Aug - 13 Aug	Turkish Airlines
10 Aug - 27 Aug	Turkish Airlines
07 Aug - 15 Sep	Turkish Airlines
08 Aug - 10 Aug	China Eastern
26 Aug - 21 Sep	Etihad Airways
16 Aug - 23 Aug	VietJet Air
03 Aug - 10 Aug	China Eastern
02 Aug - 02 Sep	Qatar Airways
21 Aug - 12 Sep	Qatar Airways
29 Aug - 21 Sep	Emirates

Also check the deals for one-way flights from Sydney to Lisbon in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Sydney to Lisbon in August from 798€

Return flights